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This enzyme is called p450, and several diet supplements and herbs have reported effects on it. Depending on how these products interact with p450, using anti-HIV drugs with them could either raise or lower the blood levels of the anti-HIV drugs. Herbs with reported effects on p450 include St. John's Wort, garlic, ginseng, melatonin, milk thistle (silymarin), geniposide and skullcap. For more detailed information on St. John's Wort, read NIH Study Cautions Use of St. John's Wort with Anti-HIV drugs.
Cnidium Monnieri is, supposedly, a frequently prescribed herb among Chinese Medicine practitioners for male impotence. It has traditionally been used for treatment of male erections (or the lack thereof) alongside Epimedium Sagittatum (related to Horny Goat Weed) and the plant Semen Cuscutae.